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ACTUAL OCR 2024 OCR A Level PHYSICS A May-June 2024 Question Paper 3 WITH MARK SCHEME
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ACTUAL OCR 2024 OCR A Level PHYSICS A May-June 2024 Question Paper 3 WITH MARK SCHEME
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, 2
Answer all the questions.
1 A flute is a musical instrument made from a long tube that is open at both ends.
A stationary sound wave in the tube produces a musical note.
The lowest frequency note that a standard flute produces in air is 262 Hz.
The speed of sound in air at a temperature of 20 °C is 340 m s–1.
(a) Show that a standard flute has an approximate length of 0.65 m.
[3]
(b) In an ideal gas, the speed v of sound is given by
⎛γRT⎞1/2
v=⎝ M ⎠
where
γ is a dimensionless constant that depends on the gas
R is the molar gas constant
T is the absolute temperature
M is the molar mass of the gas.
The table below shows values of γ and M for both air and helium.
Gas γ M / g mol–1
Air 1.40 29.0
Helium 1.67 4.00
© OCR 2024
, 3
(i) The kinetic model of an ideal gas assumes that there are a large number of particles in rapid,
random motion.
State two further assumptions for the kinetic model of an ideal gas.
1 .......................................................................................................................................................
..........................................................................................................................................................
2 .......................................................................................................................................................
.................................................................................................................................................... [2]
(ii) A standard flute is placed inside a sealed chamber.
The chamber is filled with helium at a temperature of –10 °C.
Calculate the lowest frequency that the flute could produce inside the chamber.
frequency = ................................................... Hz [4]
© OCR 2024 Turn over
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